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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0605a47633d3de38762ca3e808a0efbebf6802bc1a265f24574b7ba96fee1bd' 
  AND token = 'Osjb7g+LQ52AfZUkxvAiqBAtf20kBNhuHFXEyB/dCsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}